<p class="ql-block"><b>2B Unint10 there is thunder-2</b></p><p class="ql-block">視頻:清華英語(yǔ)，復(fù)述粉豬第一季《windy castle》</p><p class="ql-block">音頻:清華英語(yǔ)，漢語(yǔ)第三冊(cè)</p> <b>1. Static Electricity Experiments</b><br><br>Here are some experiments that allow the kids to learn about static electricity. This teaches kids about the positive and negative charges and where they come from.<br><br>(1) Sticking a balloon to a wall<br><br>* Materials:<br>? balloon<br>? a piece of wool, nylon or fur<br>? wall<br><br>* Process:<br>Blow up the balloon and tie it.<br>Rub the balloon with your piece of wool, nylon or fur quickly.<br>Put the balloon against the wall and let go.<br>Watch what happens. It should stick to the wall.<br><br>* Explanation:<br>Why does this happen? When you rub the balloon, you’re covering it with little negative charges. The negative charges are attracted to the positive charges that are in the wall. That’s why the balloon ‘sticks’ to the wall. 摩擦氣球時(shí)，會(huì)在氣球表面聚集負(fù)電荷。 當(dāng)帶有負(fù)電荷的氣球靠近墻壁時(shí)，會(huì)被墻上的正電荷所吸引。<br><br><br> <b>2. Make your hair stand up</b><div><b><br></b>Materials: balloon<br>Process:<br>Blow up the balloon and tie it.<br>Rub it against your hair on top of your head.<br>Watch what happens! Your hair will stick up!<br><br>This also happens when you take off your wool hat in the wintertime. You usually notice static electricity in the winter when the air is very dry. During the summer, the air is more humid. The water in the air helps electrons move off you more quickly, so you can not build up as big of a charge. 在冬天脫下羊毛帽子時(shí)，也會(huì)發(fā)生這種情況。 通常會(huì)在冬天空氣干燥的時(shí)候注意到靜電。 在夏季不容易產(chǎn)生是因?yàn)榭諝飧睗瘢?空氣中的水有助于電子更快地離開(kāi)，因此無(wú)法積聚很多電荷。<br>Explanation:<br>Why does this happen? It's because of static electricity! When you rub the balloon on your hair, you’re covering it with little negative charges. Now that each of the hairs has the same charge, they want to repel each other. In other words, the hairs try to get as far away from each other as possible.是因?yàn)殪o電！ 當(dāng)在頭發(fā)上摩擦氣球時(shí)，頭發(fā)上的負(fù)電荷全都轉(zhuǎn)移到氣球上面，使得每根頭發(fā)都具有正電荷，因此它們會(huì)互相排斥。<br></div> <p class="ql-block">感覺(jué)長(zhǎng)頭發(fā)實(shí)驗(yàn)起來(lái)不是很明顯，只能讓娃感覺(jué)下??！</p> <p class="ql-block"><b>3. lightning</b></p><p class="ql-block">I bought a lightning card for you. now let's play with the card. I am going to press this . And then you can see the lightning flashing in the air.</p><p class="ql-block">How can we make the lightning with this card?</p><p class="ql-block">Because Lightning is an electric current[?k?r?nt]電流，The wire and the card carry some electricity.</p><p class="ql-block">There are many ice crystals in a thundercloud. You are a ice crystal. And I am a ice crystal too.</p><p class="ql-block">the electricity produced in a cloud-only happens when the cold and hot winds blowing the clouds mix together. We bump into each other as we move around in the unstable air. All of those collisions 碰撞create an electric charge. I will give all my positive charges to you. And you will give me the negative charges.</p><p class="ql-block">After a while, the whole cloud fills up with electrical charges. The positive charges at the top of the cloud and the negative charges at the bottom of the cloud.</p><p class="ql-block">The negative charges on the bottom of the cloud go looking for the positive charges on the top of the cloud..</p><p class="ql-block">When they get together…Flash!</p> <p class="ql-block">電的實(shí)驗(yàn)必須留給專(zhuān)業(yè)人士（娃爸有電工證），感覺(jué)這個(gè)單元就是給娃爸準(zhǔn)備滴，等他出來(lái)回來(lái)再搞！</p> <p class="ql-block"><b>4.Thunder</b></p><p class="ql-block">M:Thunder is something closely related to lightning. You’ll always hear thunder after you see lightning. Anyone know why?</p><p class="ql-block">Thunder is actually caused by the lightning. As the charge creates the lightning, it heats up the air around it. So when a bolt of lightning heats this air along its path, that air quickly expands膨脹. Thunder is the sound caused by that rapidly expanding air. If the charge is big, it creates a big…." “Big thunder!” “Right, it creates a big thunder clap. If it’s small, it creates..?” “A small clap?”</p><p class="ql-block">We probably wouldn’t even hear it. The bigger the charge and the closer it is, the bigger the sound.</p><p class="ql-block"><b>Make a thunder sound</b></p><p class="ql-block">Materials: trash bag</p><p class="ql-block"><b>Process:</b></p><p class="ql-block">Blow into the brown paper lunch bag and fill it up with air.</p><p class="ql-block">Twist the open end and close with your hand.</p><p class="ql-block">Quickly hit the bag with your free hand.</p><p class="ql-block"><br></p><p class="ql-block"><b>Explanation:</b></p><p class="ql-block"><br></p><p class="ql-block">Hitting the bag causes the air inside the bag to compress so quickly that the pressure breaks the bag. The air rushes out and pushes the air outside away from the bag. The air continues to move forward in a wave. When the moving air reaches your ear, you hear a sound. Thunder is produced in a similar way. As lightning strikes[stra?k] , energy is given off that heat the air through which it passes. This heated air quickly expands producing energetic waves of air resulting in a sound called thunder. 敲打袋子會(huì)使袋子內(nèi)的空氣壓縮得如此之快，以至于壓力使袋子破裂。 空氣涌出并將空氣向外推離袋子。 空氣繼續(xù)向前移動(dòng)。 當(dāng)移動(dòng)的空氣到達(dá)耳朵時(shí)，就可以聽(tīng)到聲音。 雷電的產(chǎn)生方式與此類(lèi)似。 雷擊時(shí)，會(huì)釋放出能量，從而加熱空氣穿過(guò)的空氣。 加熱的空氣迅速膨脹，產(chǎn)生高能的空氣波，從而產(chǎn)生雷聲。</p> <b>5. Lightning and thunder</b><br><br>Light travels much faster than sound<br><br>Thunder and lightning start at the same time,but we will see the lightning first.<br><br>When a starting pistol [?p?stl] is fired we see the smoke first and then hear the bang.<br><br>打雷和閃電同時(shí)開(kāi)始，但我們先看到閃電。<br><br>當(dāng)發(fā)令槍開(kāi)火時(shí)，我們先看到煙霧，然后聽(tīng)到爆炸聲。<br><br>Since light travels about five seconds per mile, you can count from the time you see the lightning to know its distance from you. <p class="ql-block"><b>指讀第七周</b></p><p class="ql-block">指讀時(shí)間30分鐘，指讀完可以自己分配時(shí)間看丫丫，還可以得到一個(gè)星星??，累計(jì)星星得??，這個(gè)方法不錯(cuò)！</p> <p class="ql-block"><b>小趣事</b></p><p class="ql-block">上次把小丫頭搗鼓的實(shí)驗(yàn)水倒了，特別傷心，還抱怨我！今天又搗鼓了一瓶神仙水，說(shuō)要寫(xiě)個(gè)牌子，說(shuō)不可以倒。真的是吃一塹，長(zhǎng)一智！??</p>
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